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          <h1 class="post-title" itemprop="name headline">synchronized</h1>
        

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        <h2 id="synchronized可以分成5类用法-可以用来修饰-实例方法"><a href="#synchronized可以分成5类用法-可以用来修饰-实例方法" class="headerlink" title="synchronized可以分成5类用法,可以用来修饰 实例方法"></a>synchronized可以分成5类用法,可以用来修饰 实例方法</h2><table>
<thead>
<tr>
<th>修饰的目标</th>
<th>实际锁住的对象</th>
<th>伪代码</th>
</tr>
</thead>
<tbody>
<tr>
<td>实例方法</td>
<td>类的实例对象</td>
<td>public synchronized void remove(){…    }</td>
</tr>
<tr>
<td>静态方法</td>
<td>类对象</td>
<td>public static synchronized void remove(){…}</td>
</tr>
<tr>
<td>实例对象</td>
<td>类的实例对象</td>
<td>synchronized(this) {…}</td>
</tr>
<tr>
<td>class对象</td>
<td>类对象</td>
<td>synchronized (RatedArena.class){…}</td>
</tr>
<tr>
<td>任意实例对象obj</td>
<td>实例对象obj</td>
<td>String s = “”;<br>synchronized (s){…}</td>
</tr>
</tbody>
</table>
<p>写了两个方法,一个遍历方法,一个remove方法.如果有并发问题,那么遍历方会会抛一个异常.<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">public  synchronized void remove() throws InterruptedException &#123;</span><br><span class="line">        System.out.println(&quot;remove start&quot;);</span><br><span class="line">        list.remove(0);</span><br><span class="line">        list.add(String.valueOf(KOSTimeUtils.getCurrentMills()));</span><br><span class="line">        list.add(String.valueOf(KOSTimeUtils.getCurrentMills()));</span><br><span class="line">        Thread.sleep(100);</span><br><span class="line">        System.out.println(&quot;remove end&quot;);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    public  synchronized void forLoop() throws InterruptedException &#123;</span><br><span class="line">        for (String s : list) &#123;</span><br><span class="line">            Thread.sleep(100);</span><br><span class="line">            System.out.println(&quot; loop   &quot; + s);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure></p>
<p>然后用两个线程分别跑这两个方法.<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">static List&lt;String&gt; list = Lists.newArrayList();</span><br><span class="line"></span><br><span class="line">   @Test</span><br><span class="line">   public void testSynchronizedMethod() throws InterruptedException &#123;</span><br><span class="line">       list.add(String.valueOf(KOSTimeUtils.getCurrentMills()));</span><br><span class="line">       new Thread(new Runnable() &#123;</span><br><span class="line"></span><br><span class="line">           @Override</span><br><span class="line">           public void run() &#123;</span><br><span class="line">               while (true) &#123;</span><br><span class="line">                   try &#123;</span><br><span class="line">                       SynchronizedMethodTest test = new SynchronizedMethodTest();</span><br><span class="line">                       test.forLoop();</span><br><span class="line">                   &#125; catch (InterruptedException e) &#123;</span><br><span class="line">                       e.printStackTrace();</span><br><span class="line">                   &#125;</span><br><span class="line">               &#125;</span><br><span class="line">           &#125;</span><br><span class="line">       &#125;).start();</span><br><span class="line">       new Thread(new Runnable() &#123;</span><br><span class="line"></span><br><span class="line">           @Override</span><br><span class="line">           public void run() &#123;</span><br><span class="line">               while (true) &#123;</span><br><span class="line">                   try &#123;</span><br><span class="line">                       SynchronizedMethodTest test = new SynchronizedMethodTest();</span><br><span class="line">                       test.remove();</span><br><span class="line">                   &#125; catch (InterruptedException e) &#123;</span><br><span class="line">                       e.printStackTrace();</span><br><span class="line">                   &#125;</span><br><span class="line">               &#125;</span><br><span class="line">           &#125;</span><br><span class="line">       &#125;).start();</span><br><span class="line">       Thread.sleep(10000000L);</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure></p>
<h5 id="修饰静态方法肯定是没问题的"><a href="#修饰静态方法肯定是没问题的" class="headerlink" title="修饰静态方法肯定是没问题的"></a>修饰静态方法肯定是没问题的</h5><h5 id="修饰非静态方法如果都是用同一个对象的remove-和forLoo-方法也没问题-但是如果修改一下调用方法"><a href="#修饰非静态方法如果都是用同一个对象的remove-和forLoo-方法也没问题-但是如果修改一下调用方法" class="headerlink" title="修饰非静态方法如果都是用同一个对象的remove()和forLoo()方法也没问题,但是如果修改一下调用方法:"></a>修饰非静态方法如果都是用同一个对象的remove()和forLoo()方法也没问题,但是如果修改一下调用方法:</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">SynchronizedMethodTest test = new SynchronizedMethodTest();</span><br><span class="line">test.forLoop();</span><br><span class="line">...</span><br><span class="line">SynchronizedMethodTest test = new SynchronizedMethodTest();</span><br><span class="line">test.remove();</span><br></pre></td></tr></table></figure>
<p>loop的时候就会抛异常了<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">java.util.ConcurrentModificationException</span><br><span class="line">	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)</span><br><span class="line">	at java.util.ArrayList$Itr.next(ArrayList.java:859)</span><br><span class="line">	at thread.SynchronizedMethodTest.forLoop(SynchronizedMethodTest.java:61)</span><br><span class="line">	at thread.SynchronizedMethodTest$1.run(SynchronizedMethodTest.java:25)</span><br><span class="line">	at java.lang.Thread.run(Thread.java:748)</span><br></pre></td></tr></table></figure></p>
<h5 id="因为他们锁的是不同的类实例-但是list是静态的-操作的是同一个list"><a href="#因为他们锁的是不同的类实例-但是list是静态的-操作的是同一个list" class="headerlink" title="因为他们锁的是不同的类实例,但是list是静态的,操作的是同一个list."></a>因为他们锁的是不同的类实例,但是list是静态的,操作的是同一个list.</h5><p>这是由于synchronized是基于每个对象的monitor来实现的,不同对象不需要抢同一个monitor</p>
<h5 id="如果有一个方法没有被synchronized修饰-那就不需要抢monitor了-也会有并发问题"><a href="#如果有一个方法没有被synchronized修饰-那就不需要抢monitor了-也会有并发问题" class="headerlink" title="如果有一个方法没有被synchronized修饰,那就不需要抢monitor了,也会有并发问题"></a>如果有一个方法没有被synchronized修饰,那就不需要抢monitor了,也会有并发问题</h5>
      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#synchronized可以分成5类用法-可以用来修饰-实例方法"><span class="nav-number">1.</span> <span class="nav-text">synchronized可以分成5类用法,可以用来修饰 实例方法</span></a><ol class="nav-child"><li class="nav-item nav-level-5"><a class="nav-link" href="#修饰静态方法肯定是没问题的"><span class="nav-number">1.0.0.1.</span> <span class="nav-text">修饰静态方法肯定是没问题的</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#修饰非静态方法如果都是用同一个对象的remove-和forLoo-方法也没问题-但是如果修改一下调用方法"><span class="nav-number">1.0.0.2.</span> <span class="nav-text">修饰非静态方法如果都是用同一个对象的remove()和forLoo()方法也没问题,但是如果修改一下调用方法:</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#因为他们锁的是不同的类实例-但是list是静态的-操作的是同一个list"><span class="nav-number">1.0.0.3.</span> <span class="nav-text">因为他们锁的是不同的类实例,但是list是静态的,操作的是同一个list.</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#如果有一个方法没有被synchronized修饰-那就不需要抢monitor了-也会有并发问题"><span class="nav-number">1.0.0.4.</span> <span class="nav-text">如果有一个方法没有被synchronized修饰,那就不需要抢monitor了,也会有并发问题</span></a></li></ol></li></ol></div>
            

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